Data processing apparatus



March 11, 1969 R. WILSON 3,431,833

DATA raocnssms APPARATUS Original Filed July 31, 1961 Sheet of z March 11, 1969 1.. R. wmsou DATA rnocnssme APPARATUS Original Filed (July 31. 1961 2 off.

Sheet United States Patent Office 3,431,833 Patented Mar. 11, 1969 3,431,833 DATA PROCESSING APPARATUS Loren R. Wilson, Rolling Hills, Calif., assignor to The Magnavox Company, Torrance, Calif., a corporation of Delaware Continuation of application Ser. No. 128,236, July 31, 1961. This application July 28, 1965, Ser. No. 482,016 U.S. CI. 95-12 5 Claims Int. Cl. G03b 29/00 ABSTRACT OF THE DISCLOSURE A keyboard actuated system for obtaining a projection on a screen of a plurality of indications represented by the actuation of the keys on the keyboard including a plurality of solenoids which are actuated by the different keys to control detents. The detents in turn control the rotation of indicator wheels. The wheels have indications which are disposed adjacent an elongated window. The indications are illuminated and projected through the window to the screen. A camera may be provided to record the indications projected on the screen.

This is a continuation of my copending application Ser. No. 128,236, filed July 31, 1961, now abandoned, and entitled, Data Processing Apparatus."

The present invention relates to data processing means and more particularly to means for permanently recording data in a visible form on a medium such as photographic film.

Heretofore when permanently recording data in a form which may be visually observed, it has been customary to punch or print the data on a suitable medium such as a paper tape. Although such a process has numerous advantages it has many disadvantages. Since the printing process requires a large amount of mechanical movement of various printing elements the speed of the process is slow. Also due to the inherently large size of the printed characters and the bulk of the paper, the density of data per unit volume is small. In addition it has been very difficult if not impossible to readily reproduce a copy of the data that has been recorded for additional study.

In order to overcome the foregoing difficulties it has been proposed to employ photographic techniques for recording on a piece of photographic film. To record the data, it has been proposed to provide a plurality of indicator wheels or similar devices that have characters representing the data provided on the face thereof. These Wheels are then positioned so that the characters are properly aligned to present the desired data to a camera. The light reflected from the wheels will thus permit the camera to take a picture thereof and thus record the data in visual form on the film. The size of thecharacters on the film may be of extremely small size, to thereby greatly increase the density of the stored data per unit volume. In the event a person desires to observe the data it may be optically enlarged by any well-known means to any convenient size. In addition, if it is desired the data may be photographically reproduced for subsequent use and study.

Although photographic data recording systems of this nature are a substantial improvement over the prior printing processes, they have had several disadvantages. For example, it has been found that the amount of light reflected from the indicator wheels has been very small. This is particularly true where the characters are white on a black background as is customary. As a result in order to obtain an adequate exposure of the photographic film it has been necessary heretofore to employ large amounts of light and/or large and expensive lenses on the cameras. In addition, heretofore the accuracy with which the data has been read into the apparatus has not been easily confirmed until after the data has been permanently recorded. As a result in the event an error has been made it has not been readily detectable. Moreover even if detected it has been extremely difficult if not impossible to correct the error. These characteristics of previous photograph data recording apparatus have been a serious disadvantage. This is particularly true where at least a portion of the data is to be manually read into the apparatus by a human operator and is therefore subject to frequent errors.

It is now proposed to provide means for photographically recording data which will overcome the foregoing difiiculties. More particularly it is proposed to provide a data processing apparatus that will permit photographically recording the data with a minimum amount of light while permitting the use of a short exposure time and an inexpensive camera lens. It is also proposed to provide means to permit the operator to visually observe and confirm the data before it is permanently recorded. More particularly, it is proposed to provide means that includes at least one indicator wheel that has a source of illumination disposed therein and a transparent portion through which the light may radiate radially outwardly therethrough. In addition, opaque portions are provided on the transparent portion that are effective to block the passage of light therethrough. The contrasting transparent and opaque portions may thus be effective to form characters representing the data to be recorded. As a consequence the light will project outwardly from the transparent portions directly to the camera. Accordingly since the camera will be taking pictures from the direct light instead of reflected light a more efiicient use of the light will thereby be made. This in turn will permit a smaller cheaper lens and/or a shorter exposure time. In addition, since the light is traveling radially outwardly from only the transparent portions, the characters will be projected in ever increasing proportions as the distaice from the light sources increases. A screen may thus be positioned SO that the characters may be projected thereon so as to be visible to the operator. As a result the operator may visually observe and confirmthe accuracy of the data before the camera records it.

These and other features and advantages of the present invention will become more apparent after reading the following description when taken in connection with the accompanying drawings wherein like reference numerals indicate like parts and wherein:

FIGURE 1 is a schematic diagram of a data recording system embodying the present invention;

FIGURE 2 is a front view of the indicator unit embodied in the system of FIGURE 1;

FIGURE 3 is a cross sectional view taken substantially along the plane of line 33 in FIGURE 4 and looking in the direction of the arrows thereon;

FIGURE 4 is a front view similar to FIGURE 2 but showing a portion of the interior of the indicator unit;

FIGURE 5 is a perspective view of an indicator Wheel employed in the indicator unit; and

FIGURE 6 is a view of a combination source of illumination and bearing support for the indicator wheel.

Referring to the drawings in more detail, the present invention is embodied in a data processing system 10 for permanently recording data in a form suitable for future use. More particularly, the present system 10 includes a keyboard 12 which may be manually actuatable and is interconnected with an indicator unit 14 by a cable 16 so as to thereby be elfective to control the indicator unit 14. The indicator unit 14 includes a plurality of indicator wheels 18 which have characters 20 thereon corresponding to the characters 20 to be read into the keyboard 12. The wheels 18 are positioned so that only a single character on each wheel 18 will register with a window 22 in the front of the indicator unit 14. A screen 24 is provided adjacent the keyboard 12 so that the operator may visually observe and check the data displayed at the window 22 before a camera 26 takes a picture thereof to provide a permanent record of the data on a photograph film disposed within the camera 26.

The keyboard 12 comprises a plurality of keys 28 which are mounted in a box 30 so as to project through a front panel 32 thereon. The keys 28 are arranged so that they may be manually actuated by for example individually depressing the keys in any desired order. The keys 28 may represent any suitable form of data. In the present instance the system is intended to record numbers and accordingly each of the keys represents one of the Arabic numerals and are thus marked with the characters to 9, inclusive. One or more additional keys C and R may also be provided if so desired for controlling aditional operations. For example a key C may be provided which can be depresed so as to cause the number present at the window 22 to be cleared or reset to zero to thereby permit a new number to be read thereinto. Also a key R may be provided that will be effective to cause the number to be recorded by the camera 26 and the indicator reset for an additional recording operation. It may thus be seen that by depressing the correct keys in the proper order, signals will be sent over the cable 16 to the indicator unit 14 to position the indicator wheels 18 to cause any desired number to be formed at the window 22. This number will also be presented on the screen 24 so as to be visible to the operator for verification before recording.

The indicator unit 14 includes an indicating portion 34 that encloses the indicator wheels 18 and a control portion 36 that encloses means for controlling the position of the indicator wheels relative to the window 22.

The indicating portion 34 includes a frame having a base 38 with a pair of arms that project from the 0pposite sides thereof. The base 38 is formed by a pair of substantially plane plates 44 and 46. The plates 44 and 46 are preferably plane members that are separated from each other by a space of substantially uniform height. Each of the plates 44 and 46 includes a plurality of apertures 48 and 50' that are arranged in aligned rows and columns. A separate column is provided for each wheel 18 and the number of rows corresponds generally to the number of different characters on the keyboard 12. Each of the apertures 48 in the first plate 44 are positioned to register with a corresponding aperture 50 in a corresponding row and column in the second plate 46 and vice versa. A separate detent 51, 52, '53, 54, 55, 56, 57, and 58, comprising an elongated member may be disposed in the registering apertures 48 and 50 so as to slidably mounted thereon. The inner ends 60- of the members project beyond the plate 44 and form a separate column for each indicator wheel 18. Each row of these columns contains a number of detents corresponding generally to the number of characters on the keyboard 12. The outer ends 62 of the members project beyond the plate 46 and include apertures 64 therein.

'Each of the detents 51 to 58 are slidably mounted in the apertures 48 and '50 so that they may move between a retracted position and an extended position. When in the retracted position the inner ends 60 of the detents 51 to 58 will form a generally cylindrical shape that is substantially concentric with the axes of the wheels 18. When in the extended position the inner ends 60 of the detents will project beyond the cylindrical shape. Detent 55, shown in dotted line in FIGURE 3 illustrates the position that end 60 will be in when in the extended position.

In addition each of the columns may include a lock detent 66 at the end thereof. Each of these lock detents 66 are mounted on a pin 68 so as to be able to pivot therearound. The inner ends of these detents 66 normally project radially inwardly beyond the cylindrical shape formed 4 by the inner ends 60 of the detents 51 to 58 when they are in the retracted position.

The control portion 36 which may be of any variety suitable for positioning the detents 51 to 58 may be secured to the indicating portion 34 to thereby form a single integral structure. The present control portion 36 includes a support member 69 that is positioned adjacent the plate 46 but spaced therefrom. A separate arm 70,

71, 72, 73, 74, 75, 76, 77 and 78 is provided on the support member 69 for each of the detents 5.1 to 58 and 66. Each arm 70 to 78 is movably mounted on the support member 69 so as to be able to engage the outer end 62 of a detent 51 to 58 or the end of lock detent 66. A separate electromagnet 80 or similar device may be provided on this support member 69 for each of the arms 70 to 78 to bias it outwardly against the outer end 62 of a detent 51 to 58 to force the detent into an extended position. Spring means 82 may be provided to bias the arms 70 to 78 away from the detents '51 to 58 when the electromagnet 80 is not energized. It may thus be seen that by interconnecting electromagnets 80' with the keys 28 by means of the cable 16, by depressing the various keys 28 any preselected electromagnet 80 may be energized so as to cause the arm 70 to 78 associated therewith to drive the corresponding detent 51 to 58 into an extended position. Energizing the electromagnet for the arm 70 will be effective to cause the arm 70 to ride across the end of the lock detent 66 and rotate it counter-clockwise about the pin 62.

When the electromagnets 80 are not energized, the springs 82 will return the arms 70 to 78 to their normal positions. In order to retract the detents from their extended position, means such as a long member 81 with a wedge '83- on the end thereof may be provided which may be reciprocated in the direction of the arrows of FIGURE 4 so that the wedge will be driven through the apertures 64 in the ends 62 of the detents 51 to 58. The wedge '83 will engage the edges of the apertures 68 and force all of the detents 51 to 58 back into the retracted position.

The arms 40 and 42 secured to the opposite ends of the base plates 44 and 46 project from the base 38 at substantially right angles thereto to form a space therebetween for receiving the indicator wheels 18. An aperture 88 and 90 may be provided in the outer ends of each of these plates 44 and 46 so as to register with each other.

A journal '84 may be provided that extends across the space and has the opposite ends thereof disposed in the apertures. This journal 84 is preferably rigidly secured to the two arms 40 and 42 so as to remain in a fixed position thereon. Although this journal 84 may be of any variety suitable for rotatably supporting the indicator wheels 18, in the present instance it comprises a member that has a large cylindrical exterior surface with a source of illumination in the center thereof. This source may be an elongated lamp 86 of any suitable variety. For example the lamp 86 of the incandescent variety having a filament that extends axially the entire length thereof. As a result, the lamp 86' will be effective to radiate light uniformly from the axis of the journal for the entire length thereof. If it is desired to do so, it has been found that if the exterior of the lamp 86 has a true cylindrical surface thereon, the lamp 86 itself may form the journal 84.

Each of the indicator wheels 18 may include a sheet metal frame 92 which is substantially a plane member having an hourglass shape formed by two sectors 94 and 96. The reduced portion between the two sectors 94 and 96 may include a passage 98 therethrough that forms a bearing surface adapted to slide upon the journal 84. The frame 92 will thus be supported for rotation about the axis of the lamp 8 6. A separate garter type spring 180 may be provided for each of the indicator wheels 18. Each spring 100 has one end thereof secured to a wheel 18 and the other end thereof secured to a fixed member 102 that extends between the arms 40 and 42. The springs 100 may extend over the journal 84 so as to resiliently bias the indicator wheels 18 in a counter-clockwise direction as seen in FIGURE 3.

The first sector 94 of the frame 92 may include a plurality of serrations or gear teeth 104 that are formed in the periphery thereof substantially concentric with the axis of the bearing surface. A star wheel or gear 106 may be mounted on a shaft 108 so as to mesh with the teeth 104 to thereby rotatably drive the indicator wheel 18 in a clockwise direction to reset the wheels against the tension of the spring 100.

In addition, an arm 110 may be provided on the periphery adjacent the end of teeth 104 that extends radially outwardly beyond the teeth 104. The lock detent 66 is positioned so as to engage the end of the arm 110 so as to thereby lock the indicator wheel 18 in a rest position. The arm 110 is sufliciently short to swing inside of the cylindrical shape formed by the detents 51 to 5'8 and thereby clear all of these detents that are disposed in a retracted position. However, the arm 110 is sufficiently long to engage the inner end 60 of any of the detents 511 through 58 that are disposed in the extended position. For example, as seen in dotted lines in FIGURE 4 the arm 110 engages the end '60 of the detent 55 when it is extended. It may thus be seen that by properly driving the star wheels 106 all of the indicator wheels 18 may be rotated clockwise about the journal 84 against the tensions of the springs 100 until the ends of the arms 110 pass over the lock detents 66. The wheels r18 will then be locked in a rest position. When the lock detent 66 is rotated about the pin 68, the arm 110 will pass over the end of the detent 66 and permit the spring 100 to rotate the wheel 18 on the journal 84. Once the arm 1110 has cleared the end of the detent 66 it will be free to swing across the ends of the retracted detents 5 1 to 5-8. However, if one of the detents in a column has been moved into an extended position, for example detent 55 the arm 110 will engage that detent 55. This will limit any further rotation of the wheel 18 and the spring 100 will hold the arm 110 against the detent. The wheel will thus be retained in a fixed position with the angular disposition thereof being controlled by the particular detent that is extended.

The second sector 96 of the frame 92 may have a transparent or translucent member 112 mounted thereon that forms a surface 114 disposed substantially normal to the plane of the frame 92. The surface 114 preferably extends circumferentially across the sector 96 immediately adjacent to the periphery of the frame 92. In the present instance, this surface 11 4 is formed by a transparent member 112 that is bonded or otherwise secured to one side of the sector 96. This member 112 may consist of any suitable material such as Lucite wherein the light will travel radially outwardly therethrough with little or no light escaping through the sides.

The peripheral surface 114 has at least a portion thereof positioned immediately adjacent the window 22 so that the light in the member 112 may be projected radially through the portion and out the window 22. The radially inner portion of the transparent member 112 includes a concave cylindrical surface 116 that is adapated to be disposed immediately adjacent the exterior of the lamp 86 so as to receive the light therefrom. If desired the surface 116 of the member 114 may slidably engage the lamp 86 to thereby increase the area of the bearing surface. In addition, this will insure an efficient transfer of light from the lamp 86 into the plastic member 112.

The peripheral surface 114 includes a plurality of opaque portions that are arranged to cooperate with the transparent portions to block the portions of the light in such a manner as to form characters corresponding to the data to be recorded. More particularly, in the present instance a series of opaque characters are circumferentially disposed around the transparent periphery 114.

Since the characters 20 are opaque and the periphery transparent, the light may pass through the periphery but is blocked by the characters 20. This will provide a highly luminous background with dark characters in the center thereof. It is, of course, readily apparent that if so desired the converse of this could be employed, i.e., an opaque surface with transparent portions that form luminous characters on a dark background. Although the characters 20 forming the series may be of any suitable form, they are preferably substantially identical to the characters on the keys 28 forming the keyboard 12. Thus in the present instance since it is desired to record numbers the characters 20 present on each of the wheels 18 include the Arabic numerals 0 through 9.

Each of the numbers is preferably of just sulficient size to fill the window 22. In addition, the numbers are spaced to correspond to the positions of the detent 51 to 58 and 66. That is, when the arm engages the lock detent 66 the 0 will be in line with the window. Also as the arm r110 engages the detents 51 through 58 inclusive, the numbers 1 through 8 inclusive will respectively register with the window 22. If the lock detent 66 is released and all of the detents 51 through 58 are retracted the wheel 18 will come to rest against a stop with the number 9 positionedin alignment with the window 22.

It may thus be seen that if the lamp 86 is radiating light, the light will project radially outwardly through the surface 116 and into the plastic portion 112. However, the light in line with the opaque numbers will [be blocked although the remaining light may travel through the surface 114 and out of the window 22. The light traveling through the window 22 will include a Luminous. back ground with a dark number thereon. Since the light is traveling radially outwardly in straight lines from the lamp 86 the size of the background and the number therein will be of ever-increasing proportions as the distance from the lamp 86 increases. Moreover, since the light is coming essentially froma point source the number will remain in sharp focus. It may thus be seen that by depressing any of the preselected keys 28 any one of the detents 51 to 58 in each column may be extended to engage the arms 110 as they swing past. This permits any preselected numbers to be aligned with the wind-0W 22 and to project a corresponding number therethrough.

A screen 24 may be provided that is so disposed that the numbers will be projected thereon. In the present instance this screen 24 is a translucent member positioned adjacent the keyboard 12 so that an operator may easily visually observe the numbers projected thereon. If desired, the screen 24 may be rigidly mounted in a fixed frame 118 positioned a sufficient distance from the window 22 to insure the numbers being enlarged to an adequate size to be easily read.

In order to facilitate the use of the camera 26 in photographing the numbers, the screen 24 is preferably mounted out of direct alignment with the window 22. A mirror 120 may then be angular disposed in front of the window 22 to reflect the numbers onto the screen 24. The mirror 120 is preferably mounted on a pivot 12 that may be actuated to move the mirror out of alignment with the rays of light and permit the light to travel therepast.

The camera 26 may then be disposed behind the mirror 120 and in substantially direct alignment with the window 22. The camera 26 may be of conventional design for exposing a piece of photographic film. The size of the lens 124 and speed of the shutter are set so that a proper exposure may be made of the dark letters and luminous background. Since the light reaching the camera 26 will be radiated directly from the lamp 86 to the camera 26, the amount of light reaching the camera 26 will be much greater than when the light is reflected from an opaque surface as has been customary heretofore. This will accordingly permit using a lens 124 having a smaller diameter and/ or a short exposure time.

In order to employ the present system 10 to record data on a photographic film, the operator may depress the keys 28 in a sequence that corresponds to the data to be recorded. Each time a key 28 is depressed it will produce a corresponding setting of the detents 51 to 58 in one of the columns. More particularly, in the event the key is depresesd, the lock detent 66 will not release the arm 110. The wheel 18 will thus remain stationary in the rest position with the 0 registering with the window 22. If a key 1 through 8 inclusive is depressed, a corresponding electromagnet will be energized so as to cause the arm- 110 to engage the outer end 60 of the associated detent 51 to 58 and force it into an extended position. In addition, the lock detent 66 will be tripped so as to release the arm 110 and allow the spring 100 to rotate the wheel 18 until the arm 110 comes to rest against the detent 51 to 58. This will limit further rotation of the wheel 18 sothat the number corresponding to the depressed key 28 will be aligned with the window 22. If the 9 key is depressed none of the detents 51 to 58 will be extended but the lock detent 66 will release the arm 110 and the wheel 18- will turn until it comes against the stop. If another key is depressed a similar operation will occur in the next adjacent column of detents. Thus by repeated depressing the keys any number may be read into the indicator unit and appear at the window 22.

As the indicator wheels 18 are positioned to correspond to the keys 28 depressed, the resultant number at the window 28 will be projected against the mirror 120 and reflected onto the screen 24. The operator may then visually observe the number present thereon and compare it against the number which it was intended to record. If an error was made the operator may clear the number by depressing the C button. This will cause the star wheels 106 to rotate and drive all of the indicator Wheels 18 back to zero and to retract all of the detents 51 to 58. The required number may then be re-read into the indicator unit 14.

If after confirming the accuracy of the number present on the screen 24, it is desired to photographically record the number on the film the R button may be depressed. This will cause the mirror 120 to automatically swing about the pivot 122 and be withdrawn from alignment with the window 22 so as to permit the projected number to be observed by the camera 26. The shutter of the camera will then be opened and the film exposed. Since the numbers 20 are opaque and the light projects therepast, even though the power of the lamp 86 is relatively small, there will still be more than adequate illumination to insure a perfect exposure of the film with a reasonably-sized lens 124 and time exposure. In addition, even though a negative film is employed the numbers will appear as white on 'a black background.

What is claimed is:

1. An indicator, including,

a support having an elongated journal,

a source of illumination supported by said support to radiate light,

an elongated window disposed substantially parallel to the axis of said journal,

a plurality of indicator wheels individually rotatably disposed on said journal,

a transparent member disposed on each of said indicator wheels and having a radially inner surface thereon disposed adjacent said journal whereby light from said source may be projected into said member, each of said members having a radially outer surface that has a portion thereof disposed to register with at least a portion of said window whereby the light in said member may project through said window,

means disposed on each of said radially outer surfaces to form a series of indicia that extend circumferentially around said surfaces, each of said members including means for directing a portion of the light from said source through the indicia registering with said window,

means including a manually actuatable keyboard having a plurality of keys for individually angularly positioning each of said wheels so that only those indicia on said wheels corresponding to the preselected keys in said keyboard will register with said window in accordance with the actuation of said keys to thereby project an image corresponding to said keys actuated on said keyboard,

a plurality of solenoid means each operatively coupled to an individual one of the keys in said keyboard to become individually energized in accordance with the actuation of said associated keys,

a plurality of detent means each associated with a different one of said solenoid means and having first and second positions and normally disposed in the first position and disposed in the second position in the path of rotation of the indicator wheels to limit the rotation of the indicator wheels and responsive to the energizing of the associated one of the solenoid means to become actuated by the associated one of the solenoid means to the second position, and

means operatively coupled to the indicator wheels for obtaining a rotation of the indicator wheels upon the actuation of individual ones of the detent means to the second positions.

2. The indicator set forth in claim 1, including,

a camera disposed relative to said projected image and actuatable from said keyboard to photographically record the indicia registering with said window.

3. An indicator, including,

a support having an elongated journal,

a source of illumination supported by said support to radiate light,

an elongated window disposed substantially parallel to the axis of said journal,

a plurality of indicator wheels comprising first sectoral portions and second sectoral portions,

bearing means on each of said wheels between said sectoral portions and rotatably supporting each of said indicator wheels on said journal for independent rotation about the axis of said journal,

a transparent member on each of said first sectoral portions, the transparent member having a radially inner portion disposed adjacent said journal whereby said light from said journal may project radially outwardly through each of said transparent members, each of said transparent members also including a radially outer surface disposed adjacent a portion of said window whereby the light in said members may project outwardly through said window to provide an indication at said window in accordance with the angles of rotation of said indicator wheels, each of said transparent members having a pair of substantially parallel plane surfaces on the axially opposite sides thereof whereby only light directed radially outwardly from said source and substantially normal to the radially inner surface may enter said member,

opaque material disposed on each of said radially outer surfaces to form a series of indicia that extend circumferentially around said surfaces whereby said light projected through said window will include an image of the indicia registering with said window,

a plurality of actuatable means each actuatable to represent a different value,

a plurality of control means each operatively coupled to a different one of the actuatable means to become energized upon the actuation of the associated one of the actuatable means,

a plurality of detent means each having first and second positions and being normally disposed in the first position and being operatively coupled to an individual one of the control means for actuation to the second position upon an energizing of the associated one of the control means, the detent means in the second positions being disposed relative to the second sectoral portions of the indicator wheels to interrupt the rotation of the indicator wheels and being disposed relative to the indicator wheels to interrupt the rotation of the indicator wheels after the rotation of the indicator wheels through angles corresponding to the values represented by the detent means, and

means operatively coupled to the indicator wheels for obtaining a rotation of the indicator wheels upon the actuation of the actuatable means.

4. The indicator set forth in claim 3, including,

a camera disposed relative to the windows and responsive to the actuation of said actuatable means for photographically recording the indicia at the window.

5. An indicator, including,

a support having an elongated journal,

a source of illumination supported by said support to radiate light,

an elonagted window disposed susbtantially parallel to the axis of said journal,

a plurality of indicator wheels each having a first sectoral portion and second sectoral portion and bearing means that fit on said journal and rotatably support each of said indicator wheels for independent rotation about the axis of said journal, each of said first sectoral portions including a transparent member that has an arcuate surface on the radially inner portion disposed adjacent a particular portion of said journal whereby said light from said portion may project radially outwardly through said transparent members, each of said members also including a surface on the radially outer portion disposed adjacent a portion of said window whereby the light in said members may project outwardly from said surface through said window, each of said second sectoral portions including detent means thereon,

opaque material disposed on each of said radially outer surfaces to form a series of indicia that extend circumferentially around said surfaces whereby the light projected from said outer surfaces will form a projected image of said registering indicia,

a plurality of detent means each having first and second positions and normally disposed in the first position,

a plurality of control means each operatively coupled to an indiivdual one of the detent means and having energized and de-energized states to obtain a movement of the associated detent means from the first position to the second position when energized,

a screen disposed to have said image projected thereon for manual viewing,

means including a keyboard having a plurality of keys each operatively coupled to an individual one of the control means for obtaining an energiizng of the associated one of the control means when actuated, the indicator wheels being positioned to be rotated and to have its rotation interrupted by the positioning of one of the detent means in the second position for the registry of indiica in the window by the indicator wheels in accordance with the positioning of the detent means in the second position, and

a camera operatively interconnected with said keyboard for photographically recording the indicia registering with said window.

References Cited UNITED STATES PATENTS 1,821,466 9/ 1931 Grass 954.5 2,686,455 8/1954 Porsche 88-24 2,728,155 12/1955 Hunter 23523 X 2,834,250 5/1958 Stefani 88-24- 2,909,857 10/1959 Wilson 240-1 2,979,026 4/ 1961 Renter 88-24 JOHN M. HORAN, Primary Examiner. W. A. SIVERTSON, Assistant Examiner.

U.S. Cl. XR 

